104 lines
3.1 KiB
Nim
104 lines
3.1 KiB
Nim
# Markus Maiwald (Architect) | Voxis Forge (AI)
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# Rumpk Phase 11: The Sovereign Filesystem (SFS)
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# Simple Flat System (Contiguous, Directory-based, No Inodes)
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# import ../ion # Removing to avoid cycle and ambiguity
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# import ../kernel # Removing to avoid cycle
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proc kprintln(s: cstring) {.importc, cdecl.}
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proc kprint(s: cstring) {.importc, cdecl.}
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proc kprint_hex(n: uint64) {.importc, cdecl.}
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# =========================================================
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# SFS Definitions
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# =========================================================
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const SFS_MAGIC = 0x31534653'u32 # "SFS1" in Little Endian (S=53, F=46, S=53, 1=31 -> 31 53 46 53? No, S is lowest addr)
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# "SFS1" as string: bufs[0]=S, buf[1]=F...
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# u32 representation depends on Endianness.
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# On Little Endian (RISC-V):
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# 0x31534653 -> LSB is 0x53 (S). MSB is 0x31 (1).
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# So "SFS1" in memory.
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type
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Superblock* = object
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magic*: uint32
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disk_size*: uint32 # in sectors? or bytes? Nipbox wrote u64 bytes. Let's use sectors for kernel simplicity?
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# Stack layout alignment might be issue. Let's read raw bytes.
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DirEntry* = object
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filename*: array[32, char]
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start_sector*: uint32
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size_bytes*: uint32
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reserved*: array[24, byte] # Pad to 64 bytes? 32+4+4 = 40. 64-40=24.
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# 512 / 64 = 8 entries per sector.
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# =========================================================
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# SFS State
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# =========================================================
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var sfs_mounted: bool = false
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var io_buffer: array[512, byte] # Kernel IO Buffer for FS ops
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# =========================================================
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# SFS Driver
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# =========================================================
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# Import HAL block ops
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proc virtio_blk_read(sector: uint64, buf: pointer) {.importc, cdecl.}
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proc virtio_blk_write(sector: uint64, buf: pointer) {.importc, cdecl.}
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proc sfs_mount*() =
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kprintln("[SFS] Mounting System...")
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# 1. Read Sector 0 (Superblock)
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virtio_blk_read(0, addr io_buffer[0])
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# 2. Check Magic
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# "SFS1" -> 0x53, 0x46, 0x53, 0x31
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if io_buffer[0] == 0x53 and io_buffer[1] == 0x46 and
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io_buffer[2] == 0x53 and io_buffer[3] == 0x31:
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kprintln("[SFS] Mount SUCCESS. Magic: SFS1")
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sfs_mounted = true
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else:
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kprint("[SFS] Mount FAILED. Invalid Magic. Found: ")
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kprint_hex(cast[uint64](io_buffer[0]))
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kprint(" ")
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kprint_hex(cast[uint64](io_buffer[1]))
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kprint(" ")
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kprint_hex(cast[uint64](io_buffer[2]))
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kprintln("")
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proc sfs_list*() =
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if not sfs_mounted:
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kprintln("[SFS] Error: Not mounted.")
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return
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# Read Sector 1 (Directory Table)
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virtio_blk_read(1, addr io_buffer[0])
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kprintln("[SFS] Files:")
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# Parse Entries (assuming 64 bytes stride for now if nipbox holds it)
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# Actually nipbox `mkfs` just zeroed it.
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var found = false
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var offset = 0
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while offset < 512:
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if io_buffer[offset] != 0:
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# Found entry
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var name: string = ""
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for i in 0..31:
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let c = char(io_buffer[offset+i])
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if c == '\0': break
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name.add(c)
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kprint(" - ")
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kprintln(cstring(name))
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found = true
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offset += 64
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if not found:
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kprintln(" (Empty)")
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